Feeding mechanism for sewing machines



Oct. 18, 1932. N. v. cHl'Qls'rL-:NSEN ET AL 1,883,566

FEEDING MECHANISM FOR SEWING MACHINES Filed July 7. 1930 sheets-sheet 1 i Q v y @D f l/Il/lllll//ll/M Il' Oct.18, 1932. N. v. cHRlsTENsEN ET AL FEEDING MECHANISM FOR SEWING MACHINES Filed July '7, 1930 5 Sheets-Sheet 2 Y NWWNN Oct. 18, 1932.

l N. V. CHRISTENSEN ET AL FEEDING MECHANISM FOR SEWING MACHINES Filed July 7'., 1950 I5 Sheets-Sheet 5 till" WH I Patented Oct. 18, 1932 UNITED: STATES PATENT OFFICE NORMAN V. CHRISTENSEN, OF CHICAGO, AND HAROLD J'. LE VESCONTE, O F WESTERN SPRINGS, ILLINOIS, ASSIGNORSTO UNION SPECIAL MACHINE COMPANY, OF CHI- CAGO, ILLINOIS, A CORPORATION 0F ILLINOIS FEEDING MECHANISM Fon SEWING IAGHINES Application mea LJuly 7, 1930. seria; No. 466,264.

The invention relates to new and useful improvements in a feeding mechanism for sewing machines Vand more. particularly to a puller feed used in connection with the ordinary feeding mechanism forr aiding in feeding heavy articles to and from the stitch forming mechanism. v

An object of the invention is to provide a feeding mechanism of the above type whichr may be used in connection with acylindrical work supporting arm wherein the lower puller member is disposed vbeyond the end of the work supporting arm andis operated by devices connected with the feeding mechanism located within the arm. l

A further obj ect of the invention is to provide a puller and an operating means therefor of the above character wherein the actuating devices are so arranged and housed so as not to interfere with the free movement of the tubular article being stitched olf from the end of the work supporting arm.

In the drawings which show by way of illustration one embodiment of the invention Fig. 1 is a view partly in side elevation and partly in section showing a portion of a machine embodying the improvements.

Fig. 2 is a plan view of the work supporting arm with the cover plate, throat plate and feed dog removed .andk showing the lower puller member in plan. n

Fig. 3 is a view partly in endA elevation and partly in section showing the puller mechanism onlyl andthe' supporting means therefor. y

Fig. 4 is a. plan view of the bracket-carrying the lower feed roller `showing` the feed roller y mounted therein and also showing a portion of the operating link.

Fig. 5 is a sectional Fig. 2.

The invention is directed toa puller mechanism for a feed-oif-the-arm machine. yThe lower puller member is carried by a bracket attached tothe work supporting arm and projecting in front thereof so that the lower puller member is directly` in line with the work supporting arm. The upper puller member is carried by a supporting means mounted on view of the line 5, 5 on the stitching mechanism. The lower puller vmember and its supporting means are so disposed that the tubular article after it is stitched can pass over lthe puller member an thesupporting means therefor.

In our prior Patent No. 1,7 65,206, granted June 17 7 1930, a puller mechanism is shown and described which is of the above character'. In this patent the upper puller member is positively operated. The present invention hasto do particularly with an operating mechanism for the lower puller member so that said member may be operated from the feeding mechanism within the work supportingfarm. v l

Referring more in detail to the drawings, the machine includes a cylindrical work supporting arm 1 which is supported in the usual manner. The material being stitched is fed off from the work supporting arm by a feed dog 2. The material is held on the work supporting arm by a presser foot 3 carried by a presser bar 4 mounted on the overhanging arm inthe usual manner. The machineas shown in the drawings is provided with two needles 5 and 6 and cooperating with these needles are loopers 7 and 8 respectively. The feed dog 2 is carried by a feed bar 9 which extends longitudinallyT of the work supporting arm. The feed bar is supported at the rear end so that it may slide endwise in the work supporting arm. An actuating mechanism is provided for moving said feed bar endwise which includes a link 10 pivotedvat 11 to the feed bar. The forward end of thefeed bar is y'supported by a lever 12 which carries a link rollers 18, springs 19 and an oscillating clutch plate 20. The clutch plate is provided with an arm 21 by which it may be oscillated back and forth on the shaft 17.

The rollers are adapted to engage an innerV cylindrical face formed on the puller member and thus it is that the puller member may be intermittently rotated. This puller operating mechanism per se forms no part of the present invention and any other form of intermittently rotating mechanism may be substituted therefor. At the opposite `end of the puller member from the actuating clutch member is a retaining clutch plate 22 with which a similar'arrangement of rollers and springs is provided for preventing retrograde movement of the puller roller. Attached to the depending arm 21 is a link 23. The bracket is in the form of a hollow housing with a slot 24 formed therein through which this link 23 extends beyond the end of the bracket. lilounted in the work supportingarm is a lever 25 which projects downwardly through a slot 26 in the lower face of the work supporting arm. This lever 25 is pivot-ed at 27 to the link 23. The lever is fulcrumed on a stud 28 carried by a lug v280v on the work supporting arm. The upper end ofthe llever is slotted as indicated at 29. A pin 30 carried by the feed bar 9 extends through this slot. The slot is of substantially the same width as the pin and therefore endwise movements imparted to the fed bar will cause the lever 25 to oscilla-te. At the same time the feed bar is free to be raised and lowered. The bracket 15 substantially houses the link 23 inthe region where the stitching takes place. In the forming of a tube the edge portions are brought .up over the work supporting arm and are overlapped and directed beneath the presser 4foot so thatthey will v.be stitched together. .The tube is completed therefore substantially at the stitching point. The bracket 15 tapers downwardly slightly toward its outer end. This bracket as clearly shown in Fig. 3 is of such pro-portions and dimensions that ia tube which has been stitched and completed may be fed over the bracket and the lower puller member 14.

Cooperating with this lower puller member is an upper puller roller 31. This puller roller 31 is journaled on a shaft 32 carried by a yoke 34 mounted on a bar 35 sliding vertically in lugs 36, 36 carried by a bracket 37 attached to the overhanging arm. A

spring 38 bearing against the underside of the upper lug and against the collar 39 fixed to the bar normally forces the upper puller roller 31 downwardly into contact with the lower puller roller or the material passing over the same. On the bar 35 is a pin 40 and a lever 41 adapted to engage said pin A40 is used for lifting the bar 35 and the puller roller carried thereby.

The bracket 15 is shown in plan view in Fig. 4 of the drawings. The clamping screws for securing the bracket to the work supporting arm are passed through the openings 42. Cover plates 437 43 for enclosing the loopers are respectively pivoted at 44, 44 to the bracket 15. These cover plates are adapted to be swung away from the loopers in order to give access thereto for threading.

From the above it will be apparent that we have provided a puller mechanism for a feed-o-the-arm machine wherein the puller rollers are located in the rear of the stitching mechanism and beyond the end of the work supporting arm. The lower puller roller is positively operated and by devices which are operated from the feed bar of the main feeding mechanism in the work supporting arm. This insures that the intermittent motions imparted to the puller roller shall be in timing with the movements of the feed bar. When the stroke of the feed bar is varied for changing the stitch length the feeding movement of the puller roller will be likewise varied to the same extent.

It is obvious that minor changes in the details of construction and the arrangement of parts may be made without departing from the spirit of the invention as set forth in the appended claims. y k Having thus described our invention, what we claim as newl and desire to secure by Letters Patent, is

1. The combination of a work supporting arm having a feeding mechanism for feeding the articles as stitched olf the end of the arm, a puller feeding mechanism including a lower puller roller, a bracket carried by the arm on which said roller is mounted whereby a tubular article stitched on said work supporting arm will pass over the bracket and said puller roller, an upper puller roller located above and cooperating with the lower puller roller and devices operated by the feeding mechanism in the work supporting arm for intermittentlyrota-ting said lower puller roller.

2. The combination of a work supporting arm having a feeding mechanism for feeding the articles as stitched olf the end of the arm including a feed bar, a puller feeding mechanism Vincluding a lower puller roller, a bracket carried by the arm on which said roller is mounted whereby a tubular article stitched o'n said workV supporting arm will pass over the bracket and-said puller roller, an upper puller roller located above and cooperating with the l-ower puller roller, a link extending lengthwise of said work supporting arm and connected to said lower puller roller for intermittently rotating the same and means operated by and in timing with the feed bar within the work supporting arm for moving f said link endwise. n

8. The combination of a work supporting arm having a feeding mechanism for feeding the articles as stitched off the end of the arm, a puller feeding mechanism including a lower puller roller, a bracket carried by the arm on which said roller is mounted whereby a tubular article stitched on said work supporting arm will pass over the bracket and said puller roller, an upper puller roller located above and cooperating with the lower puller roller, a link movable endwise of the work supporting arm and connected to said lower puller roller for intermittently rotating the same, a lever pivotally supported in said work supporting arm and projecting bel-ow` the same and connected to said link and means for oscillating said lever from the feeding mechanismv in said work supporting arm.

4;. The combination of a work supporting arm having a feeding mechanismy including a feed bar movable endwise in said work supp-orting arm, a puller feeding mechanism including a lower puller roller disposed at ther end of said work supporting arm, a bracket carried by said work supporting arm and projecting forwardly beyond the'end thereof for supporting said roller, an upper` puller roller cooperatingv with said lower puller roller, a link connected to said lower puller roller for operating the same and extending lengthwise of said work supporting arm, a lever mounted in said work supporting arm, said lever being pivoted at its lower end to said link and having a slot and pin connection with the feed bar at its upper end whereby said lever is oscillated by the endwise movements of said feed bar.

5. The combination of a work supporting arm having a feeding mechanism including a feed bar movable endwise in said work supporting arm, a puller feeding mechanism including a lower puller roller disposed at the end of said work supporting arm, a bracket carried by said work supporting arm and projecting forwardly beyond the end there-of for supporting said roller, an upper puller roller cooperating with said lower puller roller, a link connected to said lower puller roller for operating the same and extending lengthwise of said work supporting arm, a lever mounted in said work supporting arm, said lever being pivoted at its lower end toy said link and having a slot and pin connection with the feed bar at its upper end whereby said lever is oscillated by the endwise movements of said feed bar, said slot in the lever for the pin being vertically extended so asy to permit the feed bar to be raised and lowered.

6. The combination of a work supporting arm having a mechanism for feeding the article as stitched 0E the end of the arm, a bracket attached to said arm and projecting beyond the end thereof, a puller roller mounted -on said bracket, devices for intermittently rotating said roller including a link extending longitudinally of said arm, said bracket having a slot formed therein through which said link extends, a lever pivotally supported in said work supporting arm and projecting through a slot in the lower face thereof, said lever being connected' at its lower end to said link and means for connecting the upper end of said lever to the feeding mechanism, said bracket being shaped so as to house the link in the region of the free end-of said arm. l

,In testimony whereof, we affix our signatures.

NORMAN V. OHRISTENSEN. HAROLD J. LE VESCONTE. 

